#app > .van-config-provider {
  height: 100%;
  display: flex;
  flex-direction: column;
}

#app > .van-config-provider > .sdy-header, #app > .van-config-provider .sdy-footer {
  flex: 0 0;
}

#app > .van-config-provider > .sdy-center {
  flex: 1 1;
}

html, body, #app {
  width: 100%;
  height: 100%;
  display: block;
  overflow: hidden;
}
